If you are not worried about a bit of paper for a type conversion to gliders
why not try europe? Because they are mainly clubs rather than commercial
flying schools the flying costs tend to be cheaper.
For example a 5 day course at Lasham in the UK is 550 uk pounds (peak season)
and accomodation is 10 pounds a night.
With 12 training gliders, 5 tugs and 2 winches you will always have something
to fly